Cita APA (7a ed.)

Dunckel, J., & Parnham, E. (1993). Effective speaking for business success: Making confident presentations, using audio-visuals, and more (2nd ed.). Self-Counsel Press.

Cita Chicago Style (17a ed.)

Dunckel, Jacqueline, y Elizabeth Parnham. Effective Speaking for Business Success: Making Confident Presentations, Using Audio-visuals, and More. 2nd ed. North Vancouver, B.C.: Self-Counsel Press, 1993.

Cita MLA (8a ed.)

Dunckel, Jacqueline, y Elizabeth Parnham. Effective Speaking for Business Success: Making Confident Presentations, Using Audio-visuals, and More. 2nd ed. Self-Counsel Press, 1993.